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  1. Larger image circle = more DOF? (same focal length, format, aperture, distance)

    Read this

    https://www.largeformatphotography.info/articles/IntroToDoF.pdf

    More image circle in excess of the target film size allows you to move the film around to help composing but whatever...
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    Re: Show off your ULF camera

    Great stuff! thanks for sharing
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    Re: What's With the Rodinal? Can't Find Any

    Adox Rodinal is now available at Freestyle.

    Good timing as I was running low. I put my order through!
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    Re: HP5+ Processing and EI

    Thatís not what I would doÖ your equivalent exposure index is, well, yours. You can do controlled tests such as those described in the book ďBeyond the zone systemĒ or others, to extract it based on...
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    Re: Need box/tent to load 4x5 film

    I have 2 tents from eBay, one for 4x5 and one for 8x10 similar to these:
    ...
  6. John Higbie Invents! Watch This (Pt/Pd laser printer)

    Iím mostly impressed by the ingenuity here, the engineering skills, and the passion ó which Iím not clear where it comes from, was he a LF photographer making pt/pd and it came from there? Such a...
  7. Re: Need some info on vacuum pumps please(for use in a Vacuum frame)

    I have a cheap one like what youíre showing and it works but boy it is messy. It leaks oil (they all do) so itís sitting on a tray and I need to refill every time. I donít use it often so I can put...
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    Re: Stearman Press SP-810

    Iíve tried processing E6 with it and itís finicky if youíre trying to achieve high color accuracy. Due to the large surface to volume ratio of the SP-810 (even if covered) you lose several degC...
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    Re: Harrison Jumbo Film Changing Tent - Sticky

    I use one of those microfiber thingys that removes the dust from the outside. also use a vacuum cleaner inside every now and then. But I havenít seen dust being an issue (itís not like s itís sitting...
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    Re: Harrison Jumbo Film Changing Tent - Sticky

    Iím keeping my completely set up (meaning as a fully configured, ready to use tent) on one side of the room. Gets ventilation, A/C, etc. been there many years no issues so far. Takes up some room...
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    Re: Velvia 50 replacement

    Not sure how well it works but RawTherapee has a film simulation tool. Itís LUT based. May be worth trying.
    ...
  12. Re: I want to get better at 8x10 scanning, send me your tips!

    I run an air purifier with HEPA filter for 30min with the door closed before start scanning, and it runs through the scanning session.
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    Reciprocity - how far?

    Grant Haist in his book (vol 1) explains that

    ďduring the early stages of growth the latent image consists of a few silver atoms. Thermal energy may eject an electron from one of these silver...
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    Re: Reciprocity - how far?

    I may add that one thing that puzzles me is that the degree of reciprocity dependence of the film brand/type can be quite large. Some films can go for like 2 min without exhibiting reciprocity...
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    Re: Reciprocity - how far?

    "There is no way to know which unknown "expert" did what research before posting on Wikipedia. I don't believe any posting there unless by a known expert whom I trust to have done proper research."
    ...
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    Re: Reciprocity - how far?

    This is Wikipedia's explanation of reciprocity failure:

    At very low light levels, film is less responsive. Light can be considered to be a stream of discrete photons, and a light-sensitive...
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    Re: Building a Wet Plate Camera

    InsanityÖ hats off to him !
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    Re: Filtering for a deep red filter

    Iíve always used the manufacturerís factor Ö itís always worked wellÖ. This is b&w after all , you donít need to nail it to better than 0.5 stop, even 1 stop in many cases. The manufacturer wonít be...
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    Re: Vacuum Frame Question

    I have the medium one. Works well, I use it to make 11x14 carbon prints. I have no real complaints. The vacuum is sufficient although not amazing, but you donít need much to make good exposures; the...
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    Re: Exposure compensation for small apertures

    It can definitely be encountered, but not at small apertures.

    For example, I have a few f2.8 lenses for 4x5 so if I used them wide open for outdoors portraits with Hp5+ (iso 400) at 1/500 I would...
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    Re: Exposure compensation for small apertures

    Right, except that my question (still) is whether it will create a radial effect due to the position of the shutter within the lens. Or will it be a uniform under exposure across the entire film...
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    Exposure compensation for small apertures

    Right, right, Dan, Iím not saying the mechanism is the same, Iím asking whether the shutter opening slowly relative to the overall shutter speed (eg if it takes 1/1000 to open and 1/1000 to close and...
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    Exposure compensation for small apertures

    Just curious even if itís clear that this doesnít happen commonly in practiceÖ. since the shutter is usually (for modern lenses on copal shutters at least) somewhere in the middle of the varios glass...
  24. Re: How many color-based folks are still out there

    E6 and C41, in 4x5 and 8x10 all the way Ö whatís the point of having a camera if you donít shoot what you wantÖ.

    I just donít stop at Starbucks anymore /s
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    Re: Pop-up darkroom...

    Did you receive it yet? How do you like it?
  26. Re: Adjusting tabs to hold lens board on Chamonix 45 N-2

    Carbon fiber is not as expensive as it used to be even 10 years ago, now, non-aerospace grade carbon fiber is $10/pound. But to your point, ďwhy?Ē ó I donít know, itís certainly unnecessary.
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    Re: Arca-Swiss lensboard Adaptor

    I have the Luland version but for 171x171mm (the Oschwald era of Arcaís). It just works. Wouldnít hesitate recommending it. I have no reason to believe the 141mm version will be any different.
  28. Adjusting tabs to hold lens board on Chamonix 45 N-2

    Of course ó Iím merely pointing out that since each one costs $100, other options exist to those that cannot afford ďthe solutionĒ. Everything in life is a compromise.
  29. Re: Adjusting tabs to hold lens board on Chamonix 45 N-2

    Thatís exactly right ó and itís IMO disappointing that Chamonixís response is just issuing a warning instead of taking responsibility and replacing the camera. It used Linhof type lensboards and they...
  30. Re: Adjusting tabs to hold lens board on Chamonix 45 N-2

    Well, then maybe take a sacrificial lensboard, file it down until it fits, snuggly but not too hard, measure the new thickness (right where the camera tabs are), subtract a slight bit of margin for...
  31. Adjusting tabs to hold lens board on Chamonix 45 N-2

    Another option if you donít want to file and repaint, would be to ask Luland for a custom lensboard version that is sufficiently thinner. They do custom stuff like that. They might even cost the same...
  32. Adjusting tabs to hold lens board on Chamonix 45 N-2

    This seems surprising as the Luland boards are not particularly thick. I mean, actual linhof brand boards are a few tenths of a mm thicker than the Luland.

    How far off are you in thickness...
  33. Adjusting tabs to hold lens board on Chamonix 45 N-2

    As many others, Iíve been buying lensboards from Luland for many years and the fit perfectly, all the time, on all my Chamonix. You canít go wrong with them from a price/value standpoint either.
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    Massive Dev Chart with Rotary?

    Usually the answer is in the developer or the film manual. And usually, without pre wash itís 10-15% shorter for continuous rotation, and no change with pre-wash. But different ones make different...
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    Urge of ULF Panorama

    I am not one to suggest smaller formats Ö as you say we only live once and we should pursue our dreams.

    That said I just want to make sure youíve considered how/if such a large camera will allow...
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    Re: E-6 capacity / min volume

    Given how finicky E6 can be sometimes Iíd stick to the 30 mL min per sheet even though 24 mL might work, perhaps with a bit extra time as it will get exhausted somewhat faster. Or you can use 240 mL...
  37. Re: What's the BEST ultra-light weight, compact 4x5 tripod you've actually used

    What type of 8x10? Like a Chamonix 8x10 or an Arca F line? Yes several of them would be ok, for example a Gitzo Series 5, or an RRS Series 3,, or similar. For a Sinar P2Ö maybe but it starts being a...
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    E-6 capacity / min volume

    You donít say which kit youíre using ó do read the manual because different manufacturers write different capacities, BUT in general I would say NO, you need 30 mL per sheet minimum, so 300 mL for...
  39. Re: Use of X-ray film: technical discussion with example images

    I am able to tame the high intrinsic contrast of HR-U by using 510 Pyro in stand development. It also means less agitation so less chance of scratches.


    Sent from my iPhone using Tapatalk
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    4x10 how does it work and what do I need

    Interesting. I dropped 6x17 for 4x10 because I can contact print and get a nice looking print. 6x17 is a bit small and my enlarger only handles up to 4x5.

    Itís also convenient if you shoot 8x10, I...
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